Clamping device for an elongated piece

Abstract: A clamping device includes two clamping units. At least one of the clamping units includes a sheave 12 having a pinion portion 121 biased toward the other one of the clamping units so as to hold an elongated piece 9 between the clamping units and a rack member 112 engaging the pinion portion 121 of the sheave 12. Preferably, each of the clamping units has a frictional clamping surface which presses against the elongated piece 9.

Description: This invention relates to a clamping device for an elongated piece, more particularly to a clamping device for clamping steadily an elongated piece as defined in the preambles of claims 1 and 10. Such clamping devices are known from the document US-Patent No. 3 422 960. Clamping devices for clamping elongated articles is known. A conventional clamping device generally comprises a stationary unit, a guide unit spaced apart from the stationary unit at a predetermined distance, a movable unit movably mounted on the guide unit and a bias unit interconnecting the guide unit and the movable unit so as to bias the movable unit to move toward the stationary unit so as to hold an elongated piece between the stationary unit and the movable unit, wherein the guide unit comprises a guide block and a rack member mounted on a top surface of the guide block (US-Patent No. 3 422 960). However, in the conventional clamping device, the force exerted by the bias unit is insufficient to effectively clamp an elongated piece between the movable unit and the stationary unit or it may require two hand operation which is to some extent inconvenience. The main objective of this invention is to provide a clamping device for clamping steadily an elongated piece which overcomes the deficiencies of the prior art. To this end, a clamping device in accordance with an aspect of the present invention is characterized by the features specified in the characterizing part of claim 1 and a clamping device in accordance with another aspect of the present invention is characterized by the features specified in the characterizing part of claim 10. The movable unit comprises a sheave which has two wheel portions and a pinion portion that is located between the wheel portions and that engages the rack member so as to guide the wheel portions of the sheave to move on the guide block. The bias unit interconnects the guide unit and the movable unit so as to bias the wheel portions of the sheave to move toward the stationary unit, thereby holding an elongated piece between the sheave and the stationary unit. According to another aspect of the present invention, a clamping device comprises two spaced guide units, two movable units and two bias units. Each of the guide units comprises a guide block and a rack member which is secured on the top surface of the guide block. Each of the movable units comprises a sheave which has two wheel portions and a pinion portions that is located between the wheel portions and that engages a respective one of the rack members so as to guide the sheaves to move on the guide units. Each of the bias units interconnects one of the guide units and one of the movable units so as to bias the movable units to move toward each other, thereby holding an elongated piece between the movable units. Other features and advantages of the present invention will become apparent in the following detailed description of the preferred embodiments of the present invention, with reference to the accompanying drawings, in which: Fig. 1 is an elevational top view showing the first embodiment of the clamping device according to the present invention; Fig. 2 is an exploded view showing the guide unit, the movable unit and the stationary shell body of the clamping device in accordance with the present invention; Fig. 3 is an assembled view of the guide unit, the movable unit and the stationary shell body of the clamping device of the present invention; Fig. 4 illustrates the assembly of the guide unit, the movable unit and stationary shell body which can be movably mounted on a wall; Fig. 5 is a schematic view illustrating the operation of the first embodiment of the clamping device in accordance with the present invention; Fig. 6 illustrates an application of the first embodiment of the clamping device according to the present invention; Fig. 7 illustrates another application of the first embodiment of the clamping device in accordance with the present invention; Fig. 8 illustrates a further application of the first embodiment of the clamping device in accordance with the present invention; Fig. 9 is a schematic view of the second embodiment of the clamping device which has a spring interconnecting the movable unit and the stationary shell body of the clamping device of the present invention; Fig. 10 is a perspective view of the third embodiment of the clamping device according to the present invention; Fig. 11 is a sectional view showing the third embodiment of the clamping device in accordance with the present invention; Fig. 12 is an elevational top view showing two associated assemblies of the guide unit, the movable unit and the stationary shell body according to the fourth embodiment of the clamping device of the present invention; Fig. 13 is a schematic view illustrating the operation of the fourth embodiment of the clamping device according to the present invention; and Fig. 14 illustrates an application of the fourth embodiment of the clamping device according to the present invention. Referring to Figs. 1 and 2, a clamping device constructed in accordance with the first embodiment of the present invention comprises a stationary unit 14, a generally L-shaped stationary shell body 13 spaced apart from the stationary unit 14 at a predetermined distance so as to define a clamping space 15 therebetween, a generally prism-shaped guide unit confined within the stationary shell body 13 and a movable unit or sheave 12 movably mounted on the guide unit. The stationary shell body 13 has a vertical side wall 131, an L-shaped top wall 1311 extending from the rear portion of the top end of the vertical side wall 131 to define a groove 137 between the side wall 131 and the top wall 1311, a horizontal top wall 1321 extending from the front portion of the top end of the vertical side wall 131 and a horizontal bottom wall 1322 extending from the front portion of the bottom end of the vertical side wall 131. A recess 136 is formed in the shell body 13 between the top and bottom walls 1321, 1322. A vertical positioning plate 138 interconnects the top and bottom walls 1321, 1322 and is made of rubber so as to provide a frictional clamping surface. The stationary unit 14 has a frictional clamping surface which is similar to that of the vertical positioning plate 138 in construction. The guide unit comprises a guide block 11 which is confined in the recess 136 by a blocking plate 134 and which has an inclined flat top surface 111 and a rack member 112 secured to the inclined flat top surface 111. The sheave 12 has two wheel portions 122 and a pinion portion 121 that is located between the wheel portions 122 and that engages the rack member 112. The inclined flat top surface 111 of the guide block 11 functions as biasing means for biasing and thus having the sheave 12 automatically move toward the stationary unit 14 by virtue of gravity. The wheel portions 122 are made of rubber so as to provide frictional clamping surfaces. Accordingly, when the sheave 12 moves toward the stationary unit 14, the wheel portions 122 of the sheave 12 can protrude out of the recess 136 of the shell body 13 so as to define a clamping space 15 (see Fig. 1) between the sheave 12 and the stationary unit 14, thereby firmly holding an elongated piece 9 between the wheel portions 122 of the sheave 12 and the stationary unit 14, as shown in Fig. 6. The shell body 13 further comprises a block member 135 secured to the lower end portion of the vertical side wall 131 near the recess 136 so as to prevent disengagement of the wheel portions 122 from the recess 136, as shown in Fig. 3. The sheave 12 and the guide unit together constitute a clamping unit pair for cooperatively clamping therebetween a slender article. Referring to Fig. 4, the clamping device further comprises a positioning plate 8 which may be secured to a wall by means of screws (not shown) that extend through holes 81 thereof. The positioning-plate 8 has an L-shaped guide flange 82 that projects from the top end of the positioning plate 8 so as to extend into the groove 137 of the shell body 13 and a support plate 84 that projects from the bottom end of the positioning plate 8 so as to support the vertical side wall 131 thereon so as to fix the shell body 13 on the positioning plate 8 by means of screws (not shown) that extend through holes 83. Referring to Fig. 5, one of the wheel portions 122 of the sheave 12 (indicated by phantom lines) presses against the block member 135 so as to be stopped there to prevent the disengagement of the sheave 12 from the shell body 13. When it is desired to clamp a broom 9 in the clamping space 15, the vertical rod portion of the broom 9 must be extended upward through clamping space 15 so as to push the sheave 12 to roll upward along the rack member 112 of the guide block 11. Then, the sheave 12 moves toward the vertical positioning plate 138 by virtue of gravity so that the wheel portion 112 and the vertical positioning plate 138 press against the vertical rod portion of the broom 9. When the broom 9 falls slowly by virtue of gravity, the frictional force between the wheel portions 122 of the sheave 12 and the vertical rod portion guides the sheave 12 to roll downward along the rack member 112. As a result, the more the broom 9 moves downward, the more the wheel portions 122 of the sheave 12 press against the vertical rod portion of the broom 9 due to the frictional force therebetween so as to firmly clamp the broom 9 in the clamping space 15. When it is desired to remove the broom 9 from the clamping space 15, the broom 9 is pushed upward so that the wheel portions 122 of the sheave 12 can roll upward along the rack member 112 due to the frictional force between the vertical rod portion of the broom 9 and the wheel portions 122 of the sheave 12, thereby permitting removal of the broom 9 from the clamping space 15. Fig. 6 illustrates an application of the clamping device of the first embodiment of the present invention. As illustrated, a plurality of the clamping devices (only three are shown) are arranged in a row in such a manner that the shell bodies 13 are mounted on the positioning plate 8 and that in any adjacent pairs of the shell bodies 13, the recess 136 of one of the shell bodies 13 faces the vertical positioning plate 138 of the other one of the shell bodies 13, thereby defining three clamping spaces 15 therebetween. Fig. 7 illustrates another application of the clamping device of the first embodiment of the present invention. As illustrated, there are a plurality of pairs of clamping devices (only three pairs are shown) arranged in a row in such a manner that the vertical side wall 131 of each pair of the clamping devices abut against each other so as to define two rows of clamping spaces 15 therebetween. Fig. 8 illustrates a further application of the first embodiment of the present invention. As shown, a plurality of clamping devices of the present invention are mounted to a slender stand 500. The slender stand 500 has a disk member 510 mounted on the top end thereof with the clamping devices of the present invention secured to the circumference thereof for holding thereon slender articles, such as the handle of brooms or mops. The stand 500 has an expanded base 520 mounted on the bottom end thereof for soundly support the stand 500 on ground. Preferably, the base 520 has a recess 530 formed thereon to serve as a water container for receiving therein water droplets from for example wet mops that are held by the clamping devices of the present invention. Referring to Fig. 9, the clamping device of the second embodiment of the present invention is illustrated, which comprises a stationary unit 24, a stationary shell body 23, a sheave 22 and a guide block 21. The stationary unit 24, the shell body 23 and the sheave 22 are similar to those of the first embodiment in construction. The guide block 21 has a horizontal top surface on which a rack member lies and a spring element 214 which interconnects the vertical positioning plate 238 of the shell body 23 and the sheave 22 so as to bias the sheave 22 toward the stationary unit 24. Referring to Figs. 10 and 11, the clamping device of the third embodiment of the present invention is illustrated, which comprises a guide block 31, a sheave 32 and a stationary shell body 33. The guide block 31 and the sheave 32 are similar to those of the first embodiment in construction. The shell body 33 has a recess 336 defined therein so as to confine the guide block 31 and the sheave 32 therein and a vertical positioning plate 335 which is secured to the shell body 33 and which is spaced apart from the recess 336 of the shell body 33 at a predetermined distance so as to serve as a stationary unit, thereby defining a clamping space 35 between the recess 336 of the shell body 33 and the vertical positioning plate 335. Preferably, the vertical positioning plate 335 has a frictional clamping surface so as to hold steadily an elongated piece in the clamping space 35. Referring to Figs. 12 and 13, the clamping device of the fourth embodiment of the present invention is illustrated, which comprises two generally L-shaped stationary shell bodies 43 spaced apart from each other at a predetermined distance, two guide units respectively confined within the shell bodies 43 and two movable units respectively and movably mounted on the guide units. Each of the shell bodies 43 is similar to that of the first embodiment is construction and has a vertical side wall 431 secured to a wall. Each of the vertical side walls 431 of the shell bodies 43 has a vertical end surface. The vertical end surfaces abut against each other so as to form a clamping space 45 between the shell bodies 43. Each of the guide units comprises a guide block 41 confined within the recess 436 of the corresponding one of the shell bodies 43. Each of the guide blocks 41 has an inclined flat top surface 411 and a rack member 412 secured to the inclined flat top surface 411. Each of the movable units comprises a sheave 42 which is similar to that of the first embodiment in construction and is engageable with the rack member 412 of the respective one of the guide blocks 41, thereby guiding the sheaves 42 to move toward each other. Accordingly, when the sheaves 42 move toward each other, the wheel portions 421 of each of the sheaves 42 protrude out of the recess 436 of the corresponding one of the shell bodies 43 so as to hold an elongated piece 90 between the wheel portions 421 of the sheaves 42. Preferably, each of the wheel portions 421 of the sheaves 42 has a frictional clamping surface so as to hold steadily the elongated piece 90 in the clamping space 45. Fig. 14 illustrates an application of the fourth embodiment of the clamping device of the present invention. As illustrated, there are six clamping devices arranged in a row so as to define six clamping spaces 45 between the sheaves 42 of the clamping devices. It is apparent that although the invention has been described in connection with the preferred embodiments, it is contemplated that those skilled in the art may make changes to certain features of the preferred embodiments without departing from the scope of the invention as defined in the appended claims.

Claims: A clamping device for an elongated piece (9), comprising a stationary unit (14), a guide unit (11) spaced apart from said stationary unit (14) at a predetermined distance, a movable unit (12) movably mounted on said guide unit (11) and a biasing inclined flat top surface (111) interconnecting said guide unit (11) and said movable unit (12) so as to bias said movable unit (12) to move toward said stationary unit (14), thereby holding said elongated piece (9) between said stationary unit (14) and said movable unit, wherein said guide unit (11) comprises a guide block (11) and a rack member (112) mounted on a top surface of said guide block (11); characterized in that: said movable unit (12) comprises a sheave (12) which has two wheel portions (122) and a pinion portion (121) that is located between said wheel portions (122) and that engages said rack member (112) so as to guide said wheel portions (122) of said sheave (12) to move on said guide unit (11). A clamping device as claimed in Claim 1, wherein said guide block (11) has an inclined flat top surface (111) on which said rack member (112) is mounted so that when said sheave (12) is placed on said inclined flat top surface (111) of said guide block (11), said sheave (12) automatically moves toward said stationary unit (14) by virtue of gravity. A clamping device as claimed in Claim 1, wherein said bias unit comprises a spring element (214) which interconnectssaid guide block (21) and said movable unit (22) so as to bias said movable unit (22) to move toward said stationary unit (24). A clamping device as claimed in Claim 1, wherein each of said wheel portions (122) of said movable unit (12) has an outer side wall which has a curved surface formed thereon. A clamping device as claimed in Claim 1, wherein said clamping device further comprises a stationary shell body (13) spaced apart from said stationary unit (14), said shell body (13) having a vertical side wall (131) adapted to abut against and to be secured to a wall, a horizontal top wall (1321) extending from a top end of said vertical side wall (131), a horizontal bottom wall (1322) extending from a bottom end of said vertical side wall (131), a vertical positioning plate (138) interconnecting said top and bottom walls (1321,1322) and perpendicular to said vertical side wall (131) and a recess (136) formed in said shell body (13) between said top and bottom walls (1321,1322) so that said guide unit (11) is confined in said recess; whereby when said sheave (12) moves toward said stationary unit (14), said wheel portions (122) of said sheave (12) protrude out of said recess (136) of said shell body (13) so as to hold said elongated piece (9) between said wheel portions (122) of said sheave (12) and said stationary unit (14). A clamping device as claimed in Claim 5, wherein said stationary unit (14) comprises a vertical positioning plate (138) which is secured on said wall and is spaced apart from said recess (136) of said shell body (13), thereby providing a clamping space (15) between said recess (136) of said shell body (13) and said positioning plate (138). A clamping device as claimed in Claim 5, wherein said vertical stationary unit (14) is similar to said shell body (13) in construction so as to clamp said elongated piece (9) between said sheave (12) of said shell body (13) and said positioning plate (138) of said stationary unit (14). A clamping device as claimed in Claim 5, wherein said vertical positioning plate (138) of said shell body (13) has a frictional clamping surface formed thereon. A clamping device as claimed in Claim 1, wherein each of said wheel portions (122) of said sheave (12) has a frictional clamping surface formed thereon. A clamping device for an elongated piece, comprising two spaced guide units (41), two movable units (42) respectively movably mounted on said guide units (41) and twobiasing inclined flat top surface (411) respectively interconnecting said guide units (41) and said movable units (42) so as to bias said movable units (42) to move toward each other, thereby holding said elongated piece (90) between said movable units (42), wherein each of said guide units (41) comprises a guide block (41) and a rack member (412) which is secured to a top surface (411) of said guide block (41); characterized in that: each of said movable units (42) comprises a sheave (42) which has two wheel portions (421) and a pinion portion that is located between said wheel portions (421) and that is engageable with a respective one of said rack members (412) so as to guide said sheaves (42) to move toward each other on said guide units (41). A clamping device as claimed in Claim 10, wherein each of said guide blocks (41) has an inclined flat top surface (411) on which the respective rack member (412) is mounted so that when said sheaves (42) are placed on the respective inclined flat top surfaces (411), said sheaves (42) automatically move toward each other by virtue of gravity. A clamping device as claimed in Claim 10, wherein said wheel portions (421) of each of said movable units (42) have an curved outer surface formed thereon. A clamping device as claimed in Claim 10, wherein said clamping device further comprises two shell bodies (43) spaced apart from each other, each of said shell bodies (43) having a vertical side wall (431) adapted to abut against and to be secured to a wall, a horizontal top wall extending from a top end of said vertical side wall (431), a horizontal bottom wall extending from a bottom end of said vertical side wall (431), a vertical positioning plate interconnecting said top and bottom walls and perpendicular to said vertical side wall (431), and a recess (436) formed in said shell body (43) between said top and bottom walls so that said guide units (41) are respectively confined in said recesses (436) of said shell bodies (43); whereby when said sheaves (42) move toward each other, said wheel portions (421) of each of said sheaves (42) protrude out of said recess (436) of a corresponding one of said shell bodies (43) so as to hold said elongated piece (90) between said wheel portions (421) of said sheaves (42). A clamping device as claimed in Claim 1, wherein each of said wheel portions (421) of said sheaves (42) has a frictional clamping surface thereon so as to hold steadily said elongated piece (90) between said sheaves (42).

Inventors: HUANG CHIU-FENG, HUANG, CHIU-FENG
Applicants: YAMCHEN IND CO LTD, YAMCHEN INDUSTRIAL CO., LTD.
Application year: 1994
Main classification: B25H3
IPC codes: A63C11, A47B96, B25H3, F16B2, A47L13